diff options
Diffstat (limited to 'board')
| -rw-r--r-- | board/purple/memsetup.S | 5 | ||||
| -rw-r--r-- | board/purple/purple.c | 68 |
2 files changed, 72 insertions, 1 deletions
diff --git a/board/purple/memsetup.S b/board/purple/memsetup.S index 55daf8a..9c983c9 100644 --- a/board/purple/memsetup.S +++ b/board/purple/memsetup.S @@ -26,10 +26,13 @@ #include <version.h> #include <asm/regdef.h> +#define MC_IOGP 0xBF800800 .globl memsetup memsetup: - + li t0, MC_IOGP + li t1, 0xf24 + sw t1, 0(t0) j ra nop diff --git a/board/purple/purple.c b/board/purple/purple.c index 293cc56..dfd014b 100644 --- a/board/purple/purple.c +++ b/board/purple/purple.c @@ -51,6 +51,69 @@ extern int asc_serial_getc (void); extern int asc_serial_tstc (void); extern void asc_serial_setbrg (void); +static void sdram_timing_init (ulong size) +{ + register uint pass; + register uint done; + register uint count; + register uint p0, p1, p2, p3, p4; + register uint addr; + +#define WRITE_MC_IOGP_1 *(uint *)0xbf800800 = (p1<<14)+(p2<<13)+(p4<<8)+(p0<<4)+p3; +#define WRITE_MC_IOGP_2 *(uint *)0xbf800800 = (p1<<14)+(p2<<13)+((p4-16)<<8)+(p0<<4)+p3; + + done = 0; + p0 = 2; + while (p0 < 4 && done == 0) { + p1 = 0; + while (p1 < 2 && done == 0) { + p2 = 0; + while (p2 < 2 && done == 0) { + p3 = 0; + while (p3 < 16 && done == 0) { + count = 0; + p4 = 0; + while (p4 < 32 && done == 0) { + WRITE_MC_IOGP_1; + + for (addr = KSEG1 + 0x4000; + addr < KSEG1ADDR (size); + addr = addr + 4) { + *(uint *) addr = 0xaa55aa55; + } + + pass = 1; + + for (addr = KSEG1 + 0x4000; + addr < KSEG1ADDR (size) && pass == 1; + addr = addr + 4) { + if (*(uint *) addr != 0xaa55aa55) + pass = 0; + } + + if (pass == 1) { + count++; + } else { + count = 0; + } + + if (count == 32) { + WRITE_MC_IOGP_2; + done = 1; + } + p4++; + } + p3++; + } + p2++; + } + p1++; + } + p0++; + if (p0 == 1) + p0++; + } +} long int initdram(int board_type) { @@ -64,6 +127,11 @@ long int initdram(int board_type) int rows = (cfgpb0 & 0xF0) >> 4; int dw = cfgdw & 0xF; ulong size = (1 << (rows + cols)) * (1 << (dw - 1)) * CFG_NB; + void (* sdram_init) (ulong); + + sdram_init = (void (*)(ulong)) KSEG0ADDR(&sdram_timing_init); + + sdram_init(0x10000); return size; } |